Kind of a simple question, but thought I'd throw it out there. I've got a 3803 and a 5.1 setup. With only 1 set of rear surrounds, should they be connected as "A" or "B"? With a 5.1 are the surrounds considered surround speakers or back surrounds? I've got them connected to "A" surround and there is ambient sound in DD, but I'm wondering if I've got it connected wrong. Thanks.